<!DOCTYPE html>
<html>
<head>
	<title></title>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width,initial-scale=1">
	<link rel="stylesheet" type="text/css" href="css/bootstrap.min.css">
	<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css">
</head>
<body>
	<div class="container">
		<div class="btn-group">
			<button type="button" class="btn btn-info dropdown-toggle" data-toggle="dropdown">
				按钮式下拉菜单
				<span class="caret"></span>
			</button>
			<ul class="dropdown-menu" role="menu">
				<li><a href="#">1</a></li>
				<li><a href="#">2</a></li>
				<li><a href="#">3</a></li>
				<li><a href="#">4</a></li>
			</ul>
		</div>
	</div>

<br>
<!-- 分裂式按钮下拉菜单 -->
	<div class="container">
		<div class="btn-group">
			<button type="button" class="btn btn-info btn-lg">分裂式按钮下拉菜单</button>
			<button type="button" class="btn btn-info dropdown-toggle btn-lg" data-toggle="dropdown">
				<span class="caret"></span>
			</button>
			<ul class="dropdown-menu" role="menu">
				<li><a href="#">1</a></li>
				<li><a href="#">2</a></li>
				<li><a href="#">3</a></li>
				<li><a href="#">4</a></li>
			</ul>
		</div>
	</div>

	<div class="container">
		<div class="btn-group">
			<button type="button" class="btn btn-info">分裂式按钮下拉菜单</button>
			<button type="button" class="btn btn-info dropdown-toggle" data-toggle="dropdown">
				<span class="caret"></span>
			</button>
			<ul class="dropdown-menu" role="menu">
				<li><a href="#">1</a></li>
				<li><a href="#">2</a></li>
				<li><a href="#">3</a></li>
				<li><a href="#">4</a></li>
			</ul>
		</div>
	</div>

	<div class="container">
		<div class="btn-group">
			<button type="button" class="btn btn-info btn-sm">分裂式按钮下拉菜单</button>
			<button type="button" class="btn btn-info dropdown-toggle btn-sm" data-toggle="dropdown">
				<span class="caret"></span>
			</button>
			<ul class="dropdown-menu" role="menu">
				<li><a href="#">1</a></li>
				<li><a href="#">2</a></li>
				<li><a href="#">3</a></li>
				<li><a href="#">4</a></li>
			</ul>
		</div>
	</div>

	<div class="container">
		<div class="btn-group">
			<button type="button" class="btn btn-info btn-xs">分裂式按钮下拉菜单</button>
			<button type="button" class="btn btn-info dropdown-toggle btn-xs" data-toggle="dropdown">
				<span class="caret"></span>
			</button>
			<ul class="dropdown-menu" role="menu">
				<li><a href="#">1</a></li>
				<li><a href="#">2</a></li>
				<li><a href="#">3</a></li>
				<li><a href="#">4</a></li>
			</ul>
		</div>
	</div>


<script type="text/javascript" src="js/jquery-3.0.0.min.js"></script>
<script type="text/javascript" src="js/bootstrap.min.js"></script>
</body>
</html>